/* -----------------------------------------------
 /* Author : Vincent Garreau  - vincentgarreau.com
 /* MIT license: http://opensource.org/licenses/MIT
 /* Demo / Generator : vincentgarreau.com/particles.js
 /* GitHub : github.com/VincentGarreau/particles.js
 /* How to use? : Check the GitHub README
 /* v2.0.0
 /* ----------------------------------------------- */

var pJS = function(tag_id, params){

    var canvas_el = document.querySelector('#'+tag_id+' > .particles-js-canvas-el');

    /* particles.js variables with default values */
    this.pJS = {
        canvas: {
            el: canvas_el,
            w: canvas_el.offsetWidth,
            h: canvas_el.offsetHeight
        },
        particles: {
            number: {
                value: 400,
                density: {
                    enable: true,
                    value_area: 800
                }
            },
            color: {
                value: '#fff'
            },
            shape: {
                type: 'circle',
                stroke: {
                    width: 0,
                    color: '#ff0000'
                },
                polygon: {
                    nb_sides: 5
                },
                image: {
                    src: '',
                    width: 100,
                    height: 100
                }
            },
            opacity: {
                value: 1,
                random: false,
                anim: {
                    enable: false,
                    speed: 2,
                    opacity_min: 0,
                    sync: false
                }
            },
            size: {
                value: 20,
                random: false,
                anim: {
                    enable: false,
                    speed: 20,
                    size_min: 0,
                    sync: false
                }
            },
            line_linked: {
                enable: true,
                distance: 100,
                color: '#fff',
                opacity: 1,
                width: 1
            },
            move: {
                enable: true,
                speed: 2,
                direction: 'none',
                random: false,
                straight: false,
                out_mode: 'out',
                bounce: false,
                attract: {
                    enable: false,
                    rotateX: 3000,
                    rotateY: 3000
                }
            },
            array: []
        },
        interactivity: {
            detect_on: 'canvas',
            events: {
                onhover: {
                    enable: true,
                    mode: 'grab'
                },
                onclick: {
                    enable: true,
                    mode: 'push'
                },
                resize: true
            },
            modes: {
                grab:{
                    distance: 100,
                    line_linked:{
                        opacity: 1
                    }
                },
                bubble:{
                    distance: 200,
                    size: 80,
                    duration: 0.4
                },
                repulse:{
                    distance: 200,
                    duration: 0.4
                },
                push:{
                    particles_nb: 4
                },
                remove:{
                    particles_nb: 2
                }
            },
            mouse:{}
        },
        retina_detect: false,
        fn: {
            interact: {},
            modes: {},
            vendors:{}
        },
        tmp: {}
    };

    var pJS = this.pJS;

    /* params settings */
    if(params){
        Object.deepExtend(pJS, params);
    }

    pJS.tmp.obj = {
        size_value: pJS.particles.size.value,
        size_anim_speed: pJS.particles.size.anim.speed,
        move_speed: pJS.particles.move.speed,
        line_linked_distance: pJS.particles.line_linked.distance,
        line_linked_width: pJS.particles.line_linked.width,
        mode_grab_distance: pJS.interactivity.modes.grab.distance,
        mode_bubble_distance: pJS.interactivity.modes.bubble.distance,
        mode_bubble_size: pJS.interactivity.modes.bubble.size,
        mode_repulse_distance: pJS.interactivity.modes.repulse.distance
    };


    pJS.fn.retinaInit = function(){

        if(pJS.retina_detect && window.devicePixelRatio > 1){
            pJS.canvas.pxratio = window.devicePixelRatio;
            pJS.tmp.retina = true;
        }
        else{
            pJS.canvas.pxratio = 1;
            pJS.tmp.retina = false;
        }

        pJS.canvas.w = pJS.canvas.el.offsetWidth * pJS.canvas.pxratio;
        pJS.canvas.h = pJS.canvas.el.offsetHeight * pJS.canvas.pxratio;

        pJS.particles.size.value = pJS.tmp.obj.size_value * pJS.canvas.pxratio;
        pJS.particles.size.anim.speed = pJS.tmp.obj.size_anim_speed * pJS.canvas.pxratio;
        pJS.particles.move.speed = pJS.tmp.obj.move_speed * pJS.canvas.pxratio;
        pJS.particles.line_linked.distance = pJS.tmp.obj.line_linked_distance * pJS.canvas.pxratio;
        pJS.interactivity.modes.grab.distance = pJS.tmp.obj.mode_grab_distance * pJS.canvas.pxratio;
        pJS.interactivity.modes.bubble.distance = pJS.tmp.obj.mode_bubble_distance * pJS.canvas.pxratio;
        pJS.particles.line_linked.width = pJS.tmp.obj.line_linked_width * pJS.canvas.pxratio;
        pJS.interactivity.modes.bubble.size = pJS.tmp.obj.mode_bubble_size * pJS.canvas.pxratio;
        pJS.interactivity.modes.repulse.distance = pJS.tmp.obj.mode_repulse_distance * pJS.canvas.pxratio;

    };



    /* ---------- pJS functions - canvas ------------ */

    pJS.fn.canvasInit = function(){
        pJS.canvas.ctx = pJS.canvas.el.getContext('2d');
    };

    pJS.fn.canvasSize = function(){

        pJS.canvas.el.width = pJS.canvas.w;
        pJS.canvas.el.height = pJS.canvas.h;

        if(pJS && pJS.interactivity.events.resize){

            window.addEventListener('resize', function(){

                pJS.canvas.w = pJS.canvas.el.offsetWidth;
                pJS.canvas.h = pJS.canvas.el.offsetHeight;

                /* resize canvas */
                if(pJS.tmp.retina){
                    pJS.canvas.w *= pJS.canvas.pxratio;
                    pJS.canvas.h *= pJS.canvas.pxratio;
                }

                pJS.canvas.el.width = pJS.canvas.w;
                pJS.canvas.el.height = pJS.canvas.h;

                /* repaint canvas on anim disabled */
                if(!pJS.particles.move.enable){
                    pJS.fn.particlesEmpty();
                    pJS.fn.particlesCreate();
                    pJS.fn.particlesDraw();
                    pJS.fn.vendors.densityAutoParticles();
                }

                /* density particles enabled */
                pJS.fn.vendors.densityAutoParticles();

            });

        }

    };


    pJS.fn.canvasPaint = function(){
        pJS.canvas.ctx.fillRect(0, 0, pJS.canvas.w, pJS.canvas.h);
    };

    pJS.fn.canvasClear = function(){
        pJS.canvas.ctx.clearRect(0, 0, pJS.canvas.w, pJS.canvas.h);
    };


    /* --------- pJS functions - particles ----------- */

    pJS.fn.particle = function(color, opacity, position){

        /* size */
        this.radius = (pJS.particles.size.random ? Math.random() : 1) * pJS.particles.size.value;
        if(pJS.particles.size.anim.enable){
            this.size_status = false;
            this.vs = pJS.particles.size.anim.speed / 100;
            if(!pJS.particles.size.anim.sync){
                this.vs = this.vs * Math.random();
            }
        }

        /* position */
        this.x = position ? position.x : Math.random() * pJS.canvas.w;
        this.y = position ? position.y : Math.random() * pJS.canvas.h;

        /* check position  - into the canvas */
        if(this.x > pJS.canvas.w - this.radius*2) this.x = this.x - this.radius;
        else if(this.x < this.radius*2) this.x = this.x + this.radius;
        if(this.y > pJS.canvas.h - this.radius*2) this.y = this.y - this.radius;
        else if(this.y < this.radius*2) this.y = this.y + this.radius;

        /* check position - avoid overlap */
        if(pJS.particles.move.bounce){
            pJS.fn.vendors.checkOverlap(this, position);
        }

        /* color */
        this.color = {};
        if(typeof(color.value) == 'object'){

            if(color.value instanceof Array){
                var color_selected = color.value[Math.floor(Math.random() * pJS.particles.color.value.length)];
                this.color.rgb = hexToRgb(color_selected);
            }else{
                if(color.value.r != undefined && color.value.g != undefined && color.value.b != undefined){
                    this.color.rgb = {
                        r: color.value.r,
                        g: color.value.g,
                        b: color.value.b
                    }
                }
                if(color.value.h != undefined && color.value.s != undefined && color.value.l != undefined){
                    this.color.hsl = {
                        h: color.value.h,
                        s: color.value.s,
                        l: color.value.l
                    }
                }
            }

        }
        else if(color.value == 'random'){
            this.color.rgb = {
                r: (Math.floor(Math.random() * (255 - 0 + 1)) + 0),
                g: (Math.floor(Math.random() * (255 - 0 + 1)) + 0),
                b: (Math.floor(Math.random() * (255 - 0 + 1)) + 0)
            }
        }
        else if(typeof(color.value) == 'string'){
            this.color = color;
            this.color.rgb = hexToRgb(this.color.value);
        }

        /* opacity */
        this.opacity = (pJS.particles.opacity.random ? Math.random() : 1) * pJS.particles.opacity.value;
        if(pJS.particles.opacity.anim.enable){
            this.opacity_status = false;
            this.vo = pJS.particles.opacity.anim.speed / 100;
            if(!pJS.particles.opacity.anim.sync){
                this.vo = this.vo * Math.random();
            }
        }

        /* animation - velocity for speed */
        var velbase = {}
        switch(pJS.particles.move.direction){
            case 'top':
                velbase = { x:0, y:-1 };
                break;
            case 'top-right':
                velbase = { x:0.5, y:-0.5 };
                break;
            case 'right':
                velbase = { x:1, y:-0 };
                break;
            case 'bottom-right':
                velbase = { x:0.5, y:0.5 };
                break;
            case 'bottom':
                velbase = { x:0, y:1 };
                break;
            case 'bottom-left':
                velbase = { x:-0.5, y:1 };
                break;
            case 'left':
                velbase = { x:-1, y:0 };
                break;
            case 'top-left':
                velbase = { x:-0.5, y:-0.5 };
                break;
            default:
                velbase = { x:0, y:0 };
                break;
        }

        if(pJS.particles.move.straight){
            this.vx = velbase.x;
            this.vy = velbase.y;
            if(pJS.particles.move.random){
                this.vx = this.vx * (Math.random());
                this.vy = this.vy * (Math.random());
            }
        }else{
            this.vx = velbase.x + Math.random()-0.5;
            this.vy = velbase.y + Math.random()-0.5;
        }

        // var theta = 2.0 * Math.PI * Math.random();
        // this.vx = Math.cos(theta);
        // this.vy = Math.sin(theta);

        this.vx_i = this.vx;
        this.vy_i = this.vy;



        /* if shape is image */

        var shape_type = pJS.particles.shape.type;
        if(typeof(shape_type) == 'object'){
            if(shape_type instanceof Array){
                var shape_selected = shape_type[Math.floor(Math.random() * shape_type.length)];
                this.shape = shape_selected;
            }
        }else{
            this.shape = shape_type;
        }

        if(this.shape == 'image'){
            var sh = pJS.particles.shape;
            this.img = {
                src: sh.image.src,
                ratio: sh.image.width / sh.image.height
            }
            if(!this.img.ratio) this.img.ratio = 1;
            if(pJS.tmp.img_type == 'svg' && pJS.tmp.source_svg != undefined){
                pJS.fn.vendors.createSvgImg(this);
                if(pJS.tmp.pushing){
                    this.img.loaded = false;
                }
            }
        }



    };


    pJS.fn.particle.prototype.draw = function() {

        var p = this;

        if(p.radius_bubble != undefined){
            var radius = p.radius_bubble;
        }else{
            var radius = p.radius;
        }

        if(p.opacity_bubble != undefined){
            var opacity = p.opacity_bubble;
        }else{
            var opacity = p.opacity;
        }

        if(p.color.rgb){
            var color_value = 'rgba('+p.color.rgb.r+','+p.color.rgb.g+','+p.color.rgb.b+','+opacity+')';
        }else{
            var color_value = 'hsla('+p.color.hsl.h+','+p.color.hsl.s+'%,'+p.color.hsl.l+'%,'+opacity+')';
        }

        pJS.canvas.ctx.fillStyle = color_value;
        pJS.canvas.ctx.beginPath();

        switch(p.shape){

            case 'circle':
                pJS.canvas.ctx.arc(p.x, p.y, radius, 0, Math.PI * 2, false);
                break;

            case 'edge':
                pJS.canvas.ctx.rect(p.x-radius, p.y-radius, radius*2, radius*2);
                break;

            case 'triangle':
                pJS.fn.vendors.drawShape(pJS.canvas.ctx, p.x-radius, p.y+radius / 1.66, radius*2, 3, 2);
                break;

            case 'polygon':
                pJS.fn.vendors.drawShape(
                    pJS.canvas.ctx,
                    p.x - radius / (pJS.particles.shape.polygon.nb_sides/3.5), // startX
                    p.y - radius / (2.66/3.5), // startY
                    radius*2.66 / (pJS.particles.shape.polygon.nb_sides/3), // sideLength
                    pJS.particles.shape.polygon.nb_sides, // sideCountNumerator
                    1 // sideCountDenominator
                );
                break;

            case 'star':
                pJS.fn.vendors.drawShape(
                    pJS.canvas.ctx,
                    p.x - radius*2 / (pJS.particles.shape.polygon.nb_sides/4), // startX
                    p.y - radius / (2*2.66/3.5), // startY
                    radius*2*2.66 / (pJS.particles.shape.polygon.nb_sides/3), // sideLength
                    pJS.particles.shape.polygon.nb_sides, // sideCountNumerator
                    2 // sideCountDenominator
                );
                break;

            case 'image':

            function draw(){
                pJS.canvas.ctx.drawImage(
                    img_obj,
                    p.x-radius,
                    p.y-radius,
                    radius*2,
                    radius*2 / p.img.ratio
                );
            }

                if(pJS.tmp.img_type == 'svg'){
                    var img_obj = p.img.obj;
                }else{
                    var img_obj = pJS.tmp.img_obj;
                }

                if(img_obj){
                    draw();
                }

                break;

        }

        pJS.canvas.ctx.closePath();

        if(pJS.particles.shape.stroke.width > 0){
            pJS.canvas.ctx.strokeStyle = pJS.particles.shape.stroke.color;
            pJS.canvas.ctx.lineWidth = pJS.particles.shape.stroke.width;
            pJS.canvas.ctx.stroke();
        }

        pJS.canvas.ctx.fill();

    };


    pJS.fn.particlesCreate = function(){
        for(var i = 0; i < pJS.particles.number.value; i++) {
            pJS.particles.array.push(new pJS.fn.particle(pJS.particles.color, pJS.particles.opacity.value));
        }
    };

    pJS.fn.particlesUpdate = function(){

        for(var i = 0; i < pJS.particles.array.length; i++){

            /* the particle */
            var p = pJS.particles.array[i];

            // var d = ( dx = pJS.interactivity.mouse.click_pos_x - p.x ) * dx + ( dy = pJS.interactivity.mouse.click_pos_y - p.y ) * dy;
            // var f = -BANG_SIZE / d;
            // if ( d < BANG_SIZE ) {
            //     var t = Math.atan2( dy, dx );
            //     p.vx = f * Math.cos(t);
            //     p.vy = f * Math.sin(t);
            // }

            /* move the particle */
            if(pJS.particles.move.enable){
                var ms = pJS.particles.move.speed/2;
                p.x += p.vx * ms;
                p.y += p.vy * ms;
            }

            /* change opacity status */
            if(pJS.particles.opacity.anim.enable) {
                if(p.opacity_status == true) {
                    if(p.opacity >= pJS.particles.opacity.value) p.opacity_status = false;
                    p.opacity += p.vo;
                }else {
                    if(p.opacity <= pJS.particles.opacity.anim.opacity_min) p.opacity_status = true;
                    p.opacity -= p.vo;
                }
                if(p.opacity < 0) p.opacity = 0;
            }

            /* change size */
            if(pJS.particles.size.anim.enable){
                if(p.size_status == true){
                    if(p.radius >= pJS.particles.size.value) p.size_status = false;
                    p.radius += p.vs;
                }else{
                    if(p.radius <= pJS.particles.size.anim.size_min) p.size_status = true;
                    p.radius -= p.vs;
                }
                if(p.radius < 0) p.radius = 0;
            }

            /* change particle position if it is out of canvas */
            if(pJS.particles.move.out_mode == 'bounce'){
                var new_pos = {
                    x_left: p.radius,
                    x_right:  pJS.canvas.w,
                    y_top: p.radius,
                    y_bottom: pJS.canvas.h
                }
            }else{
                var new_pos = {
                    x_left: -p.radius,
                    x_right: pJS.canvas.w + p.radius,
                    y_top: -p.radius,
                    y_bottom: pJS.canvas.h + p.radius
                }
            }

            if(p.x - p.radius > pJS.canvas.w){
                p.x = new_pos.x_left;
                p.y = Math.random() * pJS.canvas.h;
            }
            else if(p.x + p.radius < 0){
                p.x = new_pos.x_right;
                p.y = Math.random() * pJS.canvas.h;
            }
            if(p.y - p.radius > pJS.canvas.h){
                p.y = new_pos.y_top;
                p.x = Math.random() * pJS.canvas.w;
            }
            else if(p.y + p.radius < 0){
                p.y = new_pos.y_bottom;
                p.x = Math.random() * pJS.canvas.w;
            }

            /* out of canvas modes */
            switch(pJS.particles.move.out_mode){
                case 'bounce':
                    if (p.x + p.radius > pJS.canvas.w) p.vx = -p.vx;
                    else if (p.x - p.radius < 0) p.vx = -p.vx;
                    if (p.y + p.radius > pJS.canvas.h) p.vy = -p.vy;
                    else if (p.y - p.radius < 0) p.vy = -p.vy;
                    break;
            }

            /* events */
            if(isInArray('grab', pJS.interactivity.events.onhover.mode)){
                pJS.fn.modes.grabParticle(p);
            }

            if(isInArray('bubble', pJS.interactivity.events.onhover.mode) || isInArray('bubble', pJS.interactivity.events.onclick.mode)){
                pJS.fn.modes.bubbleParticle(p);
            }

            if(isInArray('repulse', pJS.interactivity.events.onhover.mode) || isInArray('repulse', pJS.interactivity.events.onclick.mode)){
                pJS.fn.modes.repulseParticle(p);
            }

            /* interaction auto between particles */
            if(pJS.particles.line_linked.enable || pJS.particles.move.attract.enable){
                for(var j = i + 1; j < pJS.particles.array.length; j++){
                    var p2 = pJS.particles.array[j];

                    /* link particles */
                    if(pJS.particles.line_linked.enable){
                        pJS.fn.interact.linkParticles(p,p2);
                    }

                    /* attract particles */
                    if(pJS.particles.move.attract.enable){
                        pJS.fn.interact.attractParticles(p,p2);
                    }

                    /* bounce particles */
                    if(pJS.particles.move.bounce){
                        pJS.fn.interact.bounceParticles(p,p2);
                    }

                }
            }


        }

    };

    pJS.fn.particlesDraw = function(){

        /* clear canvas */
        pJS.canvas.ctx.clearRect(0, 0, pJS.canvas.w, pJS.canvas.h);

        /* update each particles param */
        pJS.fn.particlesUpdate();

        /* draw each particle */
        for(var i = 0; i < pJS.particles.array.length; i++){
            var p = pJS.particles.array[i];
            p.draw();
        }

    };

    pJS.fn.particlesEmpty = function(){
        pJS.particles.array = [];
    };

    pJS.fn.particlesRefresh = function(){

        /* init all */
        cancelRequestAnimFrame(pJS.fn.checkAnimFrame);
        cancelRequestAnimFrame(pJS.fn.drawAnimFrame);
        pJS.tmp.source_svg = undefined;
        pJS.tmp.img_obj = undefined;
        pJS.tmp.count_svg = 0;
        pJS.fn.particlesEmpty();
        pJS.fn.canvasClear();

        /* restart */
        pJS.fn.vendors.start();

    };


    /* ---------- pJS functions - particles interaction ------------ */

    pJS.fn.interact.linkParticles = function(p1, p2){

        var dx = p1.x - p2.x,
            dy = p1.y - p2.y,
            dist = Math.sqrt(dx*dx + dy*dy);

        /* draw a line between p1 and p2 if the distance between them is under the config distance */
        if(dist <= pJS.particles.line_linked.distance){

            var opacity_line = pJS.particles.line_linked.opacity - (dist / (1/pJS.particles.line_linked.opacity)) / pJS.particles.line_linked.distance;

            if(opacity_line > 0){

                /* style */
                var color_line = pJS.particles.line_linked.color_rgb_line;
                pJS.canvas.ctx.strokeStyle = 'rgba('+color_line.r+','+color_line.g+','+color_line.b+','+opacity_line+')';
                pJS.canvas.ctx.lineWidth = pJS.particles.line_linked.width;
                //pJS.canvas.ctx.lineCap = 'round'; /* performance issue */

                /* path */
                pJS.canvas.ctx.beginPath();
                pJS.canvas.ctx.moveTo(p1.x, p1.y);
                pJS.canvas.ctx.lineTo(p2.x, p2.y);
                pJS.canvas.ctx.stroke();
                pJS.canvas.ctx.closePath();

            }

        }

    };


    pJS.fn.interact.attractParticles  = function(p1, p2){

        /* condensed particles */
        var dx = p1.x - p2.x,
            dy = p1.y - p2.y,
            dist = Math.sqrt(dx*dx + dy*dy);

        if(dist <= pJS.particles.line_linked.distance){

            var ax = dx/(pJS.particles.move.attract.rotateX*1000),
                ay = dy/(pJS.particles.move.attract.rotateY*1000);

            p1.vx -= ax;
            p1.vy -= ay;

            p2.vx += ax;
            p2.vy += ay;

        }


    }


    pJS.fn.interact.bounceParticles = function(p1, p2){

        var dx = p1.x - p2.x,
            dy = p1.y - p2.y,
            dist = Math.sqrt(dx*dx + dy*dy),
            dist_p = p1.radius+p2.radius;

        if(dist <= dist_p){
            p1.vx = -p1.vx;
            p1.vy = -p1.vy;

            p2.vx = -p2.vx;
            p2.vy = -p2.vy;
        }

    }


    /* ---------- pJS functions - modes events ------------ */

    pJS.fn.modes.pushParticles = function(nb, pos){

        pJS.tmp.pushing = true;

        for(var i = 0; i < nb; i++){
            pJS.particles.array.push(
                new pJS.fn.particle(
                    pJS.particles.color,
                    pJS.particles.opacity.value,
                    {
                        'x': pos ? pos.pos_x : Math.random() * pJS.canvas.w,
                        'y': pos ? pos.pos_y : Math.random() * pJS.canvas.h
                    }
                )
            )
            if(i == nb-1){
                if(!pJS.particles.move.enable){
                    pJS.fn.particlesDraw();
                }
                pJS.tmp.pushing = false;
            }
        }

    };


    pJS.fn.modes.removeParticles = function(nb){

        pJS.particles.array.splice(0, nb);
        if(!pJS.particles.move.enable){
            pJS.fn.particlesDraw();
        }

    };


    pJS.fn.modes.bubbleParticle = function(p){

        /* on hover event */
        if(pJS.interactivity.events.onhover.enable && isInArray('bubble', pJS.interactivity.events.onhover.mode)){

            var dx_mouse = p.x - pJS.interactivity.mouse.pos_x,
                dy_mouse = p.y - pJS.interactivity.mouse.pos_y,
                dist_mouse = Math.sqrt(dx_mouse*dx_mouse + dy_mouse*dy_mouse),
                ratio = 1 - dist_mouse / pJS.interactivity.modes.bubble.distance;

            function init(){
                p.opacity_bubble = p.opacity;
                p.radius_bubble = p.radius;
            }

            /* mousemove - check ratio */
            if(dist_mouse <= pJS.interactivity.modes.bubble.distance){

                if(ratio >= 0 && pJS.interactivity.status == 'mousemove'){

                    /* size */
                    if(pJS.interactivity.modes.bubble.size != pJS.particles.size.value){

                        if(pJS.interactivity.modes.bubble.size > pJS.particles.size.value){
                            var size = p.radius + (pJS.interactivity.modes.bubble.size*ratio);
                            if(size >= 0){
                                p.radius_bubble = size;
                            }
                        }else{
                            var dif = p.radius - pJS.interactivity.modes.bubble.size,
                                size = p.radius - (dif*ratio);
                            if(size > 0){
                                p.radius_bubble = size;
                            }else{
                                p.radius_bubble = 0;
                            }
                        }

                    }

                    /* opacity */
                    if(pJS.interactivity.modes.bubble.opacity != pJS.particles.opacity.value){

                        if(pJS.interactivity.modes.bubble.opacity > pJS.particles.opacity.value){
                            var opacity = pJS.interactivity.modes.bubble.opacity*ratio;
                            if(opacity > p.opacity && opacity <= pJS.interactivity.modes.bubble.opacity){
                                p.opacity_bubble = opacity;
                            }
                        }else{
                            var opacity = p.opacity - (pJS.particles.opacity.value-pJS.interactivity.modes.bubble.opacity)*ratio;
                            if(opacity < p.opacity && opacity >= pJS.interactivity.modes.bubble.opacity){
                                p.opacity_bubble = opacity;
                            }
                        }

                    }

                }

            }else{
                init();
            }


            /* mouseleave */
            if(pJS.interactivity.status == 'mouseleave'){
                init();
            }

        }

        /* on click event */
        else if(pJS.interactivity.events.onclick.enable && isInArray('bubble', pJS.interactivity.events.onclick.mode)){


            if(pJS.tmp.bubble_clicking){
                var dx_mouse = p.x - pJS.interactivity.mouse.click_pos_x,
                    dy_mouse = p.y - pJS.interactivity.mouse.click_pos_y,
                    dist_mouse = Math.sqrt(dx_mouse*dx_mouse + dy_mouse*dy_mouse),
                    time_spent = (new Date().getTime() - pJS.interactivity.mouse.click_time)/1000;

                if(time_spent > pJS.interactivity.modes.bubble.duration){
                    pJS.tmp.bubble_duration_end = true;
                }

                if(time_spent > pJS.interactivity.modes.bubble.duration*2){
                    pJS.tmp.bubble_clicking = false;
                    pJS.tmp.bubble_duration_end = false;
                }
            }


            function process(bubble_param, particles_param, p_obj_bubble, p_obj, id){

                if(bubble_param != particles_param){

                    if(!pJS.tmp.bubble_duration_end){
                        if(dist_mouse <= pJS.interactivity.modes.bubble.distance){
                            if(p_obj_bubble != undefined) var obj = p_obj_bubble;
                            else var obj = p_obj;
                            if(obj != bubble_param){
                                var value = p_obj - (time_spent * (p_obj - bubble_param) / pJS.interactivity.modes.bubble.duration);
                                if(id == 'size') p.radius_bubble = value;
                                if(id == 'opacity') p.opacity_bubble = value;
                            }
                        }else{
                            if(id == 'size') p.radius_bubble = undefined;
                            if(id == 'opacity') p.opacity_bubble = undefined;
                        }
                    }else{
                        if(p_obj_bubble != undefined){
                            var value_tmp = p_obj - (time_spent * (p_obj - bubble_param) / pJS.interactivity.modes.bubble.duration),
                                dif = bubble_param - value_tmp;
                            value = bubble_param + dif;
                            if(id == 'size') p.radius_bubble = value;
                            if(id == 'opacity') p.opacity_bubble = value;
                        }
                    }

                }

            }

            if(pJS.tmp.bubble_clicking){
                /* size */
                process(pJS.interactivity.modes.bubble.size, pJS.particles.size.value, p.radius_bubble, p.radius, 'size');
                /* opacity */
                process(pJS.interactivity.modes.bubble.opacity, pJS.particles.opacity.value, p.opacity_bubble, p.opacity, 'opacity');
            }

        }

    };


    pJS.fn.modes.repulseParticle = function(p){

        if(pJS.interactivity.events.onhover.enable && isInArray('repulse', pJS.interactivity.events.onhover.mode) && pJS.interactivity.status == 'mousemove') {

            var dx_mouse = p.x - pJS.interactivity.mouse.pos_x,
                dy_mouse = p.y - pJS.interactivity.mouse.pos_y,
                dist_mouse = Math.sqrt(dx_mouse*dx_mouse + dy_mouse*dy_mouse);

            var normVec = {x: dx_mouse/dist_mouse, y: dy_mouse/dist_mouse},
                repulseRadius = pJS.interactivity.modes.repulse.distance,
                velocity = 100,
                repulseFactor = clamp((1/repulseRadius)*(-1*Math.pow(dist_mouse/repulseRadius,2)+1)*repulseRadius*velocity, 0, 50);

            var pos = {
                x: p.x + normVec.x * repulseFactor,
                y: p.y + normVec.y * repulseFactor
            }

            if(pJS.particles.move.out_mode == 'bounce'){
                if(pos.x - p.radius > 0 && pos.x + p.radius < pJS.canvas.w) p.x = pos.x;
                if(pos.y - p.radius > 0 && pos.y + p.radius < pJS.canvas.h) p.y = pos.y;
            }else{
                p.x = pos.x;
                p.y = pos.y;
            }

        }


        else if(pJS.interactivity.events.onclick.enable && isInArray('repulse', pJS.interactivity.events.onclick.mode)) {

            if(!pJS.tmp.repulse_finish){
                pJS.tmp.repulse_count++;
                if(pJS.tmp.repulse_count == pJS.particles.array.length){
                    pJS.tmp.repulse_finish = true;
                }
            }

            if(pJS.tmp.repulse_clicking){

                var repulseRadius = Math.pow(pJS.interactivity.modes.repulse.distance/6, 3);

                var dx = pJS.interactivity.mouse.click_pos_x - p.x,
                    dy = pJS.interactivity.mouse.click_pos_y - p.y,
                    d = dx*dx + dy*dy;

                var force = -repulseRadius / d * 1;

                function process(){

                    var f = Math.atan2(dy,dx);
                    p.vx = force * Math.cos(f);
                    p.vy = force * Math.sin(f);

                    if(pJS.particles.move.out_mode == 'bounce'){
                        var pos = {
                            x: p.x + p.vx,
                            y: p.y + p.vy
                        }
                        if (pos.x + p.radius > pJS.canvas.w) p.vx = -p.vx;
                        else if (pos.x - p.radius < 0) p.vx = -p.vx;
                        if (pos.y + p.radius > pJS.canvas.h) p.vy = -p.vy;
                        else if (pos.y - p.radius < 0) p.vy = -p.vy;
                    }

                }

                // default
                if(d <= repulseRadius){
                    process();
                }

                // bang - slow motion mode
                // if(!pJS.tmp.repulse_finish){
                //   if(d <= repulseRadius){
                //     process();
                //   }
                // }else{
                //   process();
                // }


            }else{

                if(pJS.tmp.repulse_clicking == false){

                    p.vx = p.vx_i;
                    p.vy = p.vy_i;

                }

            }

        }

    }


    pJS.fn.modes.grabParticle = function(p){

        if(pJS.interactivity.events.onhover.enable && pJS.interactivity.status == 'mousemove'){

            var dx_mouse = p.x - pJS.interactivity.mouse.pos_x,
                dy_mouse = p.y - pJS.interactivity.mouse.pos_y,
                dist_mouse = Math.sqrt(dx_mouse*dx_mouse + dy_mouse*dy_mouse);

            /* draw a line between the cursor and the particle if the distance between them is under the config distance */
            if(dist_mouse <= pJS.interactivity.modes.grab.distance){

                var opacity_line = pJS.interactivity.modes.grab.line_linked.opacity - (dist_mouse / (1/pJS.interactivity.modes.grab.line_linked.opacity)) / pJS.interactivity.modes.grab.distance;

                if(opacity_line > 0){

                    /* style */
                    var color_line = pJS.particles.line_linked.color_rgb_line;
                    pJS.canvas.ctx.strokeStyle = 'rgba('+color_line.r+','+color_line.g+','+color_line.b+','+opacity_line+')';
                    pJS.canvas.ctx.lineWidth = pJS.particles.line_linked.width;
                    //pJS.canvas.ctx.lineCap = 'round'; /* performance issue */

                    /* path */
                    pJS.canvas.ctx.beginPath();
                    pJS.canvas.ctx.moveTo(p.x, p.y);
                    pJS.canvas.ctx.lineTo(pJS.interactivity.mouse.pos_x, pJS.interactivity.mouse.pos_y);
                    pJS.canvas.ctx.stroke();
                    pJS.canvas.ctx.closePath();

                }

            }

        }

    };



    /* ---------- pJS functions - vendors ------------ */

    pJS.fn.vendors.eventsListeners = function(){

        /* events target element */
        if(pJS.interactivity.detect_on == 'window'){
            pJS.interactivity.el = window;
        }else{
            pJS.interactivity.el = pJS.canvas.el;
        }


        /* detect mouse pos - on hover / click event */
        if(pJS.interactivity.events.onhover.enable || pJS.interactivity.events.onclick.enable){

            /* el on mousemove */
            pJS.interactivity.el.addEventListener('mousemove', function(e){

                if(pJS.interactivity.el == window){
                    var pos_x = e.clientX,
                        pos_y = e.clientY;
                }
                else{
                    var pos_x = e.offsetX || e.clientX,
                        pos_y = e.offsetY || e.clientY;
                }

                pJS.interactivity.mouse.pos_x = pos_x;
                pJS.interactivity.mouse.pos_y = pos_y;

                if(pJS.tmp.retina){
                    pJS.interactivity.mouse.pos_x *= pJS.canvas.pxratio;
                    pJS.interactivity.mouse.pos_y *= pJS.canvas.pxratio;
                }

                pJS.interactivity.status = 'mousemove';

            });

            /* el on onmouseleave */
            pJS.interactivity.el.addEventListener('mouseleave', function(e){

                pJS.interactivity.mouse.pos_x = null;
                pJS.interactivity.mouse.pos_y = null;
                pJS.interactivity.status = 'mouseleave';

            });

        }

        /* on click event */
        if(pJS.interactivity.events.onclick.enable){

            pJS.interactivity.el.addEventListener('click', function(){

                pJS.interactivity.mouse.click_pos_x = pJS.interactivity.mouse.pos_x;
                pJS.interactivity.mouse.click_pos_y = pJS.interactivity.mouse.pos_y;
                pJS.interactivity.mouse.click_time = new Date().getTime();

                if(pJS.interactivity.events.onclick.enable){

                    switch(pJS.interactivity.events.onclick.mode){

                        case 'push':
                            if(pJS.particles.move.enable){
                                pJS.fn.modes.pushParticles(pJS.interactivity.modes.push.particles_nb, pJS.interactivity.mouse);
                            }else{
                                if(pJS.interactivity.modes.push.particles_nb == 1){
                                    pJS.fn.modes.pushParticles(pJS.interactivity.modes.push.particles_nb, pJS.interactivity.mouse);
                                }
                                else if(pJS.interactivity.modes.push.particles_nb > 1){
                                    pJS.fn.modes.pushParticles(pJS.interactivity.modes.push.particles_nb);
                                }
                            }
                            break;

                        case 'remove':
                            pJS.fn.modes.removeParticles(pJS.interactivity.modes.remove.particles_nb);
                            break;

                        case 'bubble':
                            pJS.tmp.bubble_clicking = true;
                            break;

                        case 'repulse':
                            pJS.tmp.repulse_clicking = true;
                            pJS.tmp.repulse_count = 0;
                            pJS.tmp.repulse_finish = false;
                            setTimeout(function(){
                                pJS.tmp.repulse_clicking = false;
                            }, pJS.interactivity.modes.repulse.duration*1000)
                            break;

                    }

                }

            });

        }


    };

    pJS.fn.vendors.densityAutoParticles = function(){

        if(pJS.particles.number.density.enable){

            /* calc area */
            var area = pJS.canvas.el.width * pJS.canvas.el.height / 1000;
            if(pJS.tmp.retina){
                area = area/(pJS.canvas.pxratio*2);
            }

            /* calc number of particles based on density area */
            var nb_particles = area * pJS.particles.number.value / pJS.particles.number.density.value_area;

            /* add or remove X particles */
            var missing_particles = pJS.particles.array.length - nb_particles;
            if(missing_particles < 0) pJS.fn.modes.pushParticles(Math.abs(missing_particles));
            else pJS.fn.modes.removeParticles(missing_particles);

        }

    };


    pJS.fn.vendors.checkOverlap = function(p1, position){
        for(var i = 0; i < pJS.particles.array.length; i++){
            var p2 = pJS.particles.array[i];

            var dx = p1.x - p2.x,
                dy = p1.y - p2.y,
                dist = Math.sqrt(dx*dx + dy*dy);

            if(dist <= p1.radius + p2.radius){
                p1.x = position ? position.x : Math.random() * pJS.canvas.w;
                p1.y = position ? position.y : Math.random() * pJS.canvas.h;
                pJS.fn.vendors.checkOverlap(p1);
            }
        }
    };


    pJS.fn.vendors.createSvgImg = function(p){

        /* set color to svg element */
        var svgXml = pJS.tmp.source_svg,
            rgbHex = /#([0-9A-F]{3,6})/gi,
            coloredSvgXml = svgXml.replace(rgbHex, function (m, r, g, b) {
                if(p.color.rgb){
                    var color_value = 'rgba('+p.color.rgb.r+','+p.color.rgb.g+','+p.color.rgb.b+','+p.opacity+')';
                }else{
                    var color_value = 'hsla('+p.color.hsl.h+','+p.color.hsl.s+'%,'+p.color.hsl.l+'%,'+p.opacity+')';
                }
                return color_value;
            });

        /* prepare to create img with colored svg */
        var svg = new Blob([coloredSvgXml], {type: 'image/svg+xml;charset=utf-8'}),
            DOMURL = window.URL || window.webkitURL || window,
            url = DOMURL.createObjectURL(svg);

        /* create particle img obj */
        var img = new Image();
        img.addEventListener('load', function(){
            p.img.obj = img;
            p.img.loaded = true;
            DOMURL.revokeObjectURL(url);
            pJS.tmp.count_svg++;
        });
        img.src = url;

    };


    pJS.fn.vendors.destroypJS = function(){
        cancelAnimationFrame(pJS.fn.drawAnimFrame);
        canvas_el.remove();
        pJSDom = null;
    };


    pJS.fn.vendors.drawShape = function(c, startX, startY, sideLength, sideCountNumerator, sideCountDenominator){

        // By Programming Thomas - https://programmingthomas.wordpress.com/2013/04/03/n-sided-shapes/
        var sideCount = sideCountNumerator * sideCountDenominator;
        var decimalSides = sideCountNumerator / sideCountDenominator;
        var interiorAngleDegrees = (180 * (decimalSides - 2)) / decimalSides;
        var interiorAngle = Math.PI - Math.PI * interiorAngleDegrees / 180; // convert to radians
        c.save();
        c.beginPath();
        c.translate(startX, startY);
        c.moveTo(0,0);
        for (var i = 0; i < sideCount; i++) {
            c.lineTo(sideLength,0);
            c.translate(sideLength,0);
            c.rotate(interiorAngle);
        }
        //c.stroke();
        c.fill();
        c.restore();

    };

    pJS.fn.vendors.exportImg = function(){
        window.open(pJS.canvas.el.toDataURL('image/png'), '_blank');
    };


    pJS.fn.vendors.loadImg = function(type){

        pJS.tmp.img_error = undefined;

        if(pJS.particles.shape.image.src != ''){

            if(type == 'svg'){

                var xhr = new XMLHttpRequest();
                xhr.open('GET', pJS.particles.shape.image.src);
                xhr.onreadystatechange = function (data) {
                    if(xhr.readyState == 4){
                        if(xhr.status == 200){
                            pJS.tmp.source_svg = data.currentTarget.response;
                            pJS.fn.vendors.checkBeforeDraw();
                        }else{
                            console.log('Error pJS - Image not found');
                            pJS.tmp.img_error = true;
                        }
                    }
                }
                xhr.send();

            }else{

                var img = new Image();
                img.addEventListener('load', function(){
                    pJS.tmp.img_obj = img;
                    pJS.fn.vendors.checkBeforeDraw();
                });
                img.src = pJS.particles.shape.image.src;

            }

        }else{
            console.log('Error pJS - No image.src');
            pJS.tmp.img_error = true;
        }

    };


    pJS.fn.vendors.draw = function(){

        if(pJS.particles.shape.type == 'image'){

            if(pJS.tmp.img_type == 'svg'){

                if(pJS.tmp.count_svg >= pJS.particles.number.value){
                    pJS.fn.particlesDraw();
                    if(!pJS.particles.move.enable) cancelRequestAnimFrame(pJS.fn.drawAnimFrame);
                    else pJS.fn.drawAnimFrame = requestAnimFrame(pJS.fn.vendors.draw);
                }else{
                    //console.log('still loading...');
                    if(!pJS.tmp.img_error) pJS.fn.drawAnimFrame = requestAnimFrame(pJS.fn.vendors.draw);
                }

            }else{

                if(pJS.tmp.img_obj != undefined){
                    pJS.fn.particlesDraw();
                    if(!pJS.particles.move.enable) cancelRequestAnimFrame(pJS.fn.drawAnimFrame);
                    else pJS.fn.drawAnimFrame = requestAnimFrame(pJS.fn.vendors.draw);
                }else{
                    if(!pJS.tmp.img_error) pJS.fn.drawAnimFrame = requestAnimFrame(pJS.fn.vendors.draw);
                }

            }

        }else{
            pJS.fn.particlesDraw();
            if(!pJS.particles.move.enable) cancelRequestAnimFrame(pJS.fn.drawAnimFrame);
            else pJS.fn.drawAnimFrame = requestAnimFrame(pJS.fn.vendors.draw);
        }

    };


    pJS.fn.vendors.checkBeforeDraw = function(){

        // if shape is image
        if(pJS.particles.shape.type == 'image'){

            if(pJS.tmp.img_type == 'svg' && pJS.tmp.source_svg == undefined){
                pJS.tmp.checkAnimFrame = requestAnimFrame(check);
            }else{
                //console.log('images loaded! cancel check');
                cancelRequestAnimFrame(pJS.tmp.checkAnimFrame);
                if(!pJS.tmp.img_error){
                    pJS.fn.vendors.init();
                    pJS.fn.vendors.draw();
                }

            }

        }else{
            pJS.fn.vendors.init();
            pJS.fn.vendors.draw();
        }

    };


    pJS.fn.vendors.init = function(){

        /* init canvas + particles */
        pJS.fn.retinaInit();
        pJS.fn.canvasInit();
        pJS.fn.canvasSize();
        pJS.fn.canvasPaint();
        pJS.fn.particlesCreate();
        pJS.fn.vendors.densityAutoParticles();

        /* particles.line_linked - convert hex colors to rgb */
        pJS.particles.line_linked.color_rgb_line = hexToRgb(pJS.particles.line_linked.color);

    };


    pJS.fn.vendors.start = function(){

        if(isInArray('image', pJS.particles.shape.type)){
            pJS.tmp.img_type = pJS.particles.shape.image.src.substr(pJS.particles.shape.image.src.length - 3);
            pJS.fn.vendors.loadImg(pJS.tmp.img_type);
        }else{
            pJS.fn.vendors.checkBeforeDraw();
        }

    };




    /* ---------- pJS - start ------------ */


    pJS.fn.vendors.eventsListeners();

    pJS.fn.vendors.start();



};

/* ---------- global functions - vendors ------------ */

Object.deepExtend = function(destination, source) {
    for (var property in source) {
        if (source[property] && source[property].constructor &&
            source[property].constructor === Object) {
            destination[property] = destination[property] || {};
            arguments.callee(destination[property], source[property]);
        } else {
            destination[property] = source[property];
        }
    }
    return destination;
};

window.requestAnimFrame = (function(){
    return  window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame    ||
        window.oRequestAnimationFrame      ||
        window.msRequestAnimationFrame     ||
        function(callback){
            window.setTimeout(callback, 1000 / 60);
        };
})();

window.cancelRequestAnimFrame = ( function() {
    return window.cancelAnimationFrame         ||
        window.webkitCancelRequestAnimationFrame ||
        window.mozCancelRequestAnimationFrame    ||
        window.oCancelRequestAnimationFrame      ||
        window.msCancelRequestAnimationFrame     ||
        clearTimeout
} )();

function hexToRgb(hex){
    // By Tim Down - http://stackoverflow.com/a/5624139/3493650
    // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
    var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
    hex = hex.replace(shorthandRegex, function(m, r, g, b) {
        return r + r + g + g + b + b;
    });
    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    return result ? {
        r: parseInt(result[1], 16),
        g: parseInt(result[2], 16),
        b: parseInt(result[3], 16)
    } : null;
};

function clamp(number, min, max) {
    return Math.min(Math.max(number, min), max);
};

function isInArray(value, array) {
    return array.indexOf(value) > -1;
}


/* ---------- particles.js functions - start ------------ */

window.pJSDom = [];

window.particlesJS = function(tag_id, params){

    //console.log(params);

    /* no string id? so it's object params, and set the id with default id */
    if(typeof(tag_id) != 'string'){
        params = tag_id;
        tag_id = 'particles-js';
    }

    /* no id? set the id to default id */
    if(!tag_id){
        tag_id = 'particles-js';
    }

    /* pJS elements */
    var pJS_tag = document.getElementById(tag_id),
        pJS_canvas_class = 'particles-js-canvas-el',
        exist_canvas = pJS_tag.getElementsByClassName(pJS_canvas_class);

    /* remove canvas if exists into the pJS target tag */
    if(exist_canvas.length){
        while(exist_canvas.length > 0){
            pJS_tag.removeChild(exist_canvas[0]);
        }
    }

    /* create canvas element */
    var canvas_el = document.createElement('canvas');
    canvas_el.className = pJS_canvas_class;

    /* set size canvas */
    canvas_el.style.width = "100%";
    canvas_el.style.height = "100%";

    /* append canvas */
    var canvas = document.getElementById(tag_id).appendChild(canvas_el);

    /* launch particle.js */
    if(canvas != null){
        pJSDom.push(new pJS(tag_id, params));
    }

};

window.particlesJS.load = function(tag_id, path_config_json, callback){

    /* load json config */
    var xhr = new XMLHttpRequest();
    xhr.open('GET', path_config_json);
    xhr.onreadystatechange = function (data) {
        if(xhr.readyState == 4){
            if(xhr.status == 200){
                var params = JSON.parse(data.currentTarget.response);
                window.particlesJS(tag_id, params);
                if(callback) callback();
            }else{
                console.log('Error pJS - XMLHttpRequest status: '+xhr.status);
                console.log('Error pJS - File config not found');
            }
        }
    };
    xhr.send();

};